Cosmological Constraints on $f(G)$ Dark Energy Models

Shuang-Yong Zhou, Edmund J. Copeland, Paul M. Saffin

Modified gravity theories with the Gauss-Bonnet term $G=R^2-4R^{\mu \nu }{R}_{\mu \nu }+R^{\mu \nu \rho \sigma }{R}_{\mu \nu \rho \sigma }$ have recently gained a lot of attention as a possible explanation of dark energy. We per…